The four components comprised in PCOLS are EMMA, AIM, DM, RA
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All computers contain the same set of components so the question can not be answered specifically for a DELL.All of the components, or substantially all of the components are required to make the machine work. That said I would think that all of the components are main components.The processor, memory; those are considered the heart of the machine.
The four components that all computers have in common are a keyboard, mouse, monitor, and CPU. Some other very common components are a hard drive disk, graphic cards, sound cards, memory, and motherboard and chips.
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It is best to take all components to recyclers. Best Buy will take them to recycle.
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